<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <div id="app"></div>

  <script src="https://unpkg.com/vue@next"></script>
  <script>
    Vue.createApp({
      template: `
                <div>
                    <h2>{{ message }}</h2>
                    <h2>{{ counter }}</h2>
                    <button @click="increment">+1</button>
                    <button @click="decrement">-1</button>
                </div>
            `,
      data: function () {
        return {
          message: "Hello World",
          counter: 100
        }
      },
      // 定义各种各样的方法
      methods: {
        increment() {
          this.counter++;
        },
        decrement() {
          this.counter--;
        }
      }
    }).mount("#app");
  </script>
</body>

</html>